Black Box 5000 manual Bench Configuration and Testing

CHAPTER 7: Bench Configuration and Testing

Local Multiserver Remote Multiserver

E

D

C

B

1 2 3 4 5 6

A

EZ423

Crossover Cable

Modem

1	2	3	4	5	6
	EZ423

Modem

E

D

C

B

A

Figure 7-3. Modems can be used to connect two Multiservers via an interconnect link.

7.3 Using Modems with the Interconnect Link

Figure 7-3illustrates how modems can be used to connect two Multiservers. The modems you use with your Multiservers must be V.32 or better, capable of synchronous, full-duplex, leased-line operation.

Dialup modems (instead of leased-line modems) should only be used with an analog backup link.

For both the Local and Remote Multiservers, attach the modem to the Multiserver with male-to-male crossover cable (EZ423). Configure the port for an interconnect link with external clocking.

Configure each modem for synchronous, full- duplex operation. Set the modem attached to the Remote Multiserver for Answer (or recover clocking). Set the modem attached to the Local Multiserver for Initiate (or internal clocking).

NOTE: If the modem has data compression, make sure the compression is turned off. The compression could compromise the data stream from the Multiserver.

Connect the two modems with crossover cable. The type of crossover cable that you need will depend upon the modems that you use.

Connect the cables and plug in the Multiservers. Once the modems have established a connection, the CCM indicator LEDs for the link will be off. This indicates that the link is functioning properly. In the example in Figure 7-3, the CCM indicator LED for port A1 would go off on each of the Multiservers. A flashing LED indicates a problem with your equipment or configuration.

For more information on interconnect links, refer to Section 8.4, Port Configuration, and Section 8.5, The Interconnect Link.

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